package cn.itcast.jd.util;

import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.UUID;

/**
 * Created by Administrator on 2019/8/5.
 */
@Component
public class HttpUtils {

    private PoolingHttpClientConnectionManager cm;

    public HttpUtils() {

        this.cm = new PoolingHttpClientConnectionManager();

        //设置最大连接数
        this.cm.setMaxTotal(100);

        //设置每个主机的最大连接数
        this.cm.setDefaultMaxPerRoute(10);
    }


    //根据请求地址下载页面数据
    public String doGetHtml(String url) {
        //获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(this.cm).build();
        //创建httpGet请求对象，设置url地址、
        HttpGet httpGet = new HttpGet(url);
        //设置请求信息
        httpGet.setConfig(this.getConfig());

        CloseableHttpResponse response = null;


        try {
            //创建httpClient发起请求，获取响应
            response = httpClient.execute(httpGet);
            //解析响应，返回结果
            if (response.getStatusLine().getStatusCode() == 200) {
                if (response.getEntity() != null) {
                    String content = EntityUtils.toString(response.getEntity(), "utf8");
                    return content;
                }

            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(response!=null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        //放回空串
        return "";
    }

    public String doGetImage(String url){

        //获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(this.cm).build();

        //创建httpGet请求对象，设置url地址、
        HttpGet httpGet = new HttpGet(url);

        //设置请求信息
        httpGet.setConfig(this.getConfig());

        CloseableHttpResponse response = null;


        try {
            //创建httpClient发起请求，获取响应
            response = httpClient.execute(httpGet);
            //解析响应，返回结果
            if (response.getStatusLine().getStatusCode() == 200) {
                if (response.getEntity() != null) {

                    //下载图片
                    //下载图片的后缀
                    String extName=url.substring(url.lastIndexOf("."));


                    //创建图片名，重命名图片
                    String picName=UUID.randomUUID().toString()+extName;

                    //下载图片
                    //声明OutPutStream
                    OutputStream outputStream=new FileOutputStream(new File("H:\\images\\"+picName));

                    response.getEntity().writeTo(outputStream);

                    //返回图片名称
                    return picName;

                }

            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(response!=null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        //如果下载失败，返回空串
        return "";

    }



    private RequestConfig getConfig() {
        RequestConfig config=RequestConfig.custom()
                .setConnectTimeout(1000)
                .setConnectionRequestTimeout(500)
                .setSocketTimeout(10000)
                .build();
        return config;
    }

}
